Gaschromatographyisaseparationtechniquewherebyavaporizedsampleiscarriedbyaflowingstreamof(usually)inertgasthroughatubewhichiseitherfilledwithfineparticlesoriswall-coatedwithalow-volatilityliquid.Thetubeistermedthecolumn.Ifthecolumnisfilledwithdryparticles (共 2199 字) [阅读本文] >>